Prices have increased four times and fallen five times since the beginning of the year.

The price cuts are primarily due to falling crude oil prices and Petrolimex reporting huge after-tax profits in the second quarter of VND1.12 trillion ($50.91 million), an increase of 170 per cent against the same period last year. After-tax profits in the first half were 1.58 trillion ($71.78 million), 137 per cent higher than in the first half of 2014.